Residents of Tecumseth — Sub-district A, surnames I (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 6 | ireland | arthur | M | 7 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 3 | ireland | augustus | M | 14 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 8 | ireland | charles | M | 1 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 2 | ireland | ellen | F | 16 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 9 | ireland | frances | F | 1 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 1 | ireland | mary | F | 41 | Methodist | Irish | Ireland | No Occupation Listed | 126 |
| 7 | ireland | mary | F | 5 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 5 | ireland | thos | M | 11 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 25 | ireland | william | M | 45 | Methodist | Irish | Ontario | Labourers nfs | 126 |
| 4 | ireland | wm | M | 12 | Methodist | Irish | Ontario | No Occupation Listed | 126 |
| 8 | irvin | archibald | M | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 6 | irvin | joseph | M | 40 | Presbyterian | Irish | Ireland | river drivers | 113 |
| 12 | irvin | joseph | M | 0 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 9 | irvin | margaret | F | 10 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 7 | irvin | sarah | F | 35 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 11 | irvin | thomas | M | 4 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 10 | irvin | william | M | 8 | Presbyterian | Irish | Ontario | No Occupation Listed | 113 |
| 11 | irwin | ann | F | 41 | Methodist | Scottish | Ontario | No Occupation Listed | 34 |
| 1 | irwin | ann | F | 28 | Methodist | English | Ontario | No Occupation Listed | 325 |
| 17 | irwin | anne | F | 20 | Anglican | Irish | Ontario | No Occupation Listed | 203 |
| 24 | irwin | archibald | M | 28 | Presbyterian | Irish | Ontario | Labourers nfs | 181 |
| 14 | irwin | bellana | F | 28 | Anglican | Irish | Ontario | No Occupation Listed | 203 |
| 16 | irwin | catharine | F | 23 | Anglican | Irish | Ontario | Servants nfs | 203 |
| 20 | irwin | david | M | 13 | Anglican | Irish | Ontario | No Occupation Listed | 203 |
| 20 | irwin | elizabeth | F | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 4 | irwin | fremont | M | 17 | Quaker/Society of Friends | English | Ontario | No Occupation Listed | 326 |
| 12 | irwin | george | M | 15 | Methodist | Scottish | Ontario | No Occupation Listed | 34 |
| 16 | irwin | george | M | 26 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 183 |
| 13 | irwin | george | M | 30 | Anglican | Irish | Ontario | Teamsters (inc. mine driver, etc.) | 203 |
| 1 | irwin | georgiania | F | 7 | Presbyterian | Irish | Ontario | No Occupation Listed | 181 |
| 25 | irwin | hannah | F | 27 | Presbyterian | English | England | No Occupation Listed | 181 |
| 25 | irwin | isabella | F | 34 | Presbyterian | Irish | Ontario | No Occupation Listed | 293 |
| 14 | irwin | isabella | F | 11 | Methodist | Scottish | Ontario | No Occupation Listed | 34 |
| 24 | irwin | james | M | 43 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 293 |
| 2 | irwin | james | M | 45 | Quaker/Society of Friends | English | Ontario | Agent nfs | 326 |
| 11 | irwin | john | M | 60 | Anglican | Irish | Ireland | Farmers, general and nfs | 203 |
| 15 | irwin | margaret | F | 8 | Methodist | Scottish | Ontario | No Occupation Listed | 34 |
| 23 | irwin | margaret | F | 2 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 2 | irwin | mary | F | 14 | Presbyterian | Irish | Ontario | No Occupation Listed | 293 |
| 13 | irwin | mary | F | 13 | Methodist | Scottish | Ontario | No Occupation Listed | 34 |
| 3 | irwin | mary | F | 48 | Quaker/Society of Friends | English | Ontario | No Occupation Listed | 326 |
| 19 | irwin | mary | F | 36 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 22 | irwin | mary | F | 5 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 2 | irwin | mary | F | 5 | Presbyterian | Irish | Ontario | No Occupation Listed | 181 |
| 21 | irwin | mary | F | 30 | Presbyterian | English | Ontario | No Occupation Listed | 184 |
| 3 | irwin | menette | F | 3 | Presbyterian | Irish | Ontario | No Occupation Listed | 181 |
| 25 | irwin | philedelphia | F | 68 | Methodist | Irish | Ontario | No Occupation Listed | 325 |
| 24 | irwin | rachel | F | 1 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 17 | irwin | rachel | F | 23 | Presbyterian | Scottish | Ontario | No Occupation Listed | 183 |
| 12 | irwin | rachel | F | 58 | Anglican | Irish | Ireland | No Occupation Listed | 203 |
| 18 | irwin | rachel | F | 19 | Anglican | Irish | Ontario | No Occupation Listed | 203 |
| 1 | irwin | rebecca | F | 16 | Presbyterian | Irish | Ontario | No Occupation Listed | 293 |
| 19 | irwin | robt | M | 16 | Anglican | Irish | Ontario | Labourers nfs | 203 |
| 4 | irwin | thomas | M | 7 | Presbyterian | Irish | Ontario | No Occupation Listed | 293 |
| 24 | irwin | thomas | M | 73 | Methodist | English | United States | No Occupation Listed | 325 |
| 18 | irwin | thomas | M | 41 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 101 |
| 3 | irwin | william | M | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 293 |
| 21 | irwin | william | M | 7 | Presbyterian | Irish | Ontario | No Occupation Listed | 101 |
| 20 | irwin | william | M | 31 | Presbyterian | Irish | Quebec | Farmers, general and nfs | 184 |
| 15 | irwin | wm | M | 26 | Anglican | Irish | Ontario | Sawyer, and other titled wood or sawmill operatives | 203 |